From: Daniel Wagner Date: Tue, 10 Jul 2012 08:49:18 +0000 (+0200) Subject: cgroup: Update remount documentation X-Git-Tag: firefly_0821_release~3680^2~2361^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9a8054aa5d7a98106f72d9ab76e26ebd42320ee0;p=firefly-linux-kernel-4.4.55.git cgroup: Update remount documentation Remounting support will be removed in the future (see feature-removal-schedule.txt). Discourage users from using it. Signed-off-by: Daniel Wagner Signed-off-by: Tejun Heo Cc: Rob Landley Cc: Paul Menage Cc: Li Zefan Cc: Frederic Weisbecker Cc: KAMEZAWA Hiroyuki --- diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index 97a0d1a6a5ae..4a0b64c605fc 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -370,15 +370,12 @@ To mount a cgroup hierarchy with just the cpuset and memory subsystems, type: # mount -t cgroup -o cpuset,memory hier1 /sys/fs/cgroup/rg1 -To change the set of subsystems bound to a mounted hierarchy, just -remount with different options: -# mount -o remount,cpuset,blkio hier1 /sys/fs/cgroup/rg1 - -Now memory is removed from the hierarchy and blkio is added. - -Note this will add blkio to the hierarchy but won't remove memory or -cpuset, because the new options are appended to the old ones: -# mount -o remount,blkio /sys/fs/cgroup/rg1 +While remounting cgroups is currently supported, it is not recommend +to use it. Remounting allows changing bound subsystems and +release_agent. Rebinding is hardly useful as it only works when the +hierarchy is empty and release_agent itself should be replaced with +conventional fsnotify. The support for remounting will be removed in +the future. To Specify a hierarchy's release_agent: # mount -t cgroup -o cpuset,release_agent="/sbin/cpuset_release_agent" \